/**
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* @fileoverview Disallow sparse arrays
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* @author Nicholas C. Zakas
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description: "disallow sparse arrays",
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category: "Possible Errors",
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recommended: true,
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url: "https://eslint.org/docs/rules/no-sparse-arrays"
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},
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schema: [],
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messages: {
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unexpectedSparseArray: "Unexpected comma in middle of array."
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}
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},
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create(context) {
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//--------------------------------------------------------------------------
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// Public
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//--------------------------------------------------------------------------
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return {
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ArrayExpression(node) {
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const emptySpot = node.elements.indexOf(null) > -1;
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if (emptySpot) {
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context.report({ node, messageId: "unexpectedSparseArray" });
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}
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}
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};
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}
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};
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